JPS6220493Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a technique for eliminating standing water (drain) within a flexible membrane weir.

Flexible membrane weirs, commonly referred to as rubber weirs, which expand and contract when fluids such as air and water are introduced and discharged, are widely used for intake of agricultural water, seawater dams at river mouths, and the like.

However, in pneumatic rubber weirs, the moisture contained in the filled air condenses inside and accumulates at the bottom of the weir, so if supply and exhaust pipes are installed at the bottom of the weir, this accumulated water can cause problems when exhausting air. Become. Even if a supply/exhaust system is not provided at the bottom of the dam, if the amount of accumulated water increases, the rubber dam will not be completely collapsed. Therefore, it is necessary to drain the water accumulated in the rubber weir (hereinafter simply referred to as drain) one after another.

As this drainage device, for example, those shown in FIGS. 1 to 3 are known.

(1) In the device shown in Fig. 1, a drain reservoir 04 with a lower level than the bottom of the rubber weir 01 is provided on the seawall B side, and a drain discharge pipe 02 equipped with a check valve 03 is conducted into the drain reservoir 04. When the water level of the drain discharged into the drain reservoir 04 rises and the float valve 05 opens, the drain is discharged through the drain pipe 06.

(2) In the device shown in Fig. 2, the drain discharge pipe 02 pulled out from the bottom of the rubber weir 01 is connected to the drain reservoir 04.
When the water level of the drain discharged into the drain reservoir 04 rises and the float switch FS detects this, the valve 07 is opened and at the same time, the drain pump P is operated and the water is drained through the drain pipe 08. Drain is discharged.

(3) In the device shown in Fig. 3, the drain discharge pipe 02 is
It is installed on the downstream side of rubber weir 01, and valve 0
The drain is discharged by the operation in step 9.

However, with the device shown in Figure 1, it is necessary to provide a space below the river bed outside of the seawall B.
The construction cost for installing the rubber weir increases, and the device shown in Figure 2 requires a space lower than the riverbed as described above, and the operating mechanism of the drainage pump P and valve 07 is complicated and frequently breaks down. Furthermore, the use of the drain pump P is limited to electric pumps, and with the device shown in Figure 3, it is impossible to remove the drain if there is water depth downstream of the rubber weir 01. I have this problem.

The present invention was developed in consideration of such circumstances, and includes a flexible membrane weir installed watertightly across the riverbed and the slopes adjacent to both banks of the river.
Separately from the opening of the supply and exhaust pipe, an opening for a reservoir discharge pipe is provided in the riverbed surface, and a drainage pump is connected to the tip of the reservoir discharge pipe led out above the weir high water head level,
The present invention is characterized in that a check valve is disposed in the accumulated water discharge pipe at a level equal to or lower than the opening of the accumulated water discharge pipe.

The purpose of the present invention is to provide a flexible membrane weir equipped with a drain discharge device that can perform drain discharge operations in an operation room provided on the seawall side, has a simple structure, and has low equipment costs. It is in.

In the present invention, as described above, a reservoir water discharge pipe (hereinafter referred to as a drain discharge pipe) has one end opened at the bottom of the flexible membrane weir and the other end led out above the weir high water head level. A drain pump is connected to the other end, and a check valve is installed on the drain discharge pipe at a level equal to or lower than the bottom of the weir, so when discharging the drain inside the flexible membrane weir, the drain Priming water may be injected into the drain discharge pipe through the pump to fill the space from the check valve to the drainage pump, and then the drainage pump may be operated. Therefore, drain discharge work can be performed in the operation room provided on the seawall side. In addition, the installation level of the drainage pump should be determined by its head, but in this invention, the air pressure inside the flexible membrane weir can be used as back pressure, so the drainage pump can be installed at a correspondingly higher position. In practice, there is no need to dig a space into the sea wall to install the control room, and the installation cost is low. Furthermore, the drain discharge device according to the present invention has a simple structure because it only includes a check valve and a drain pump attached to the drain discharge pipe.

An embodiment of the present invention will be described below with reference to FIGS. 4 and 5.

A rubber dam 1, which is a flexible membrane dam, is laid watertight over a top surface 2a and a slope 3 of a riverbed concrete 2.

Further, an opening 4a of a supply/exhaust pipe 4 communicating with the space inside the rubber weir 1 is provided on the slope 3, and the other end of the supply/exhaust pipe 4 is guided into an operation room O on the seawall B, and a valve 5 is connected to the opening 4a. It is connected to the blower 7 via. An exhaust valve 6 is also attached to the outlet end of the supply and exhaust pipe 4.

Furthermore, the opening 10a of the drain discharge pipe 10 buried from the riverbed concrete 2 to the bank B
is provided at the bottom of the rubber dam 1, that is, the top surface 2a of the river bed concrete 2, and a check valve 11 is attached to the drain discharge pipe 10 at a position lower than the top surface 2a. The end of the drain discharge pipe 10 led out into the operation chamber O is connected to a drainage pump P via a valve 12. In addition, check valve 1
1 only allows flow in the direction of the arrow in Fig. 4, and may be buried in the riverbed concrete 2, but as shown in Fig. 5, a concave part 2b is provided in the riverbed concrete 2 and the A check valve 11 is installed in the
It is also possible to have a structure in which a cover 13 is attached to the concave portion 2b. In this case, maintenance of the check valve 11 can be performed as appropriate, and the cover 13 can also prevent foreign matter from entering the recessed portion 2b.

Further, the height difference H between the top surface 2a of the riverbed concrete 2 and the drainage pump P can be set to be larger than the lifting head of the drainage pump. This is because when the rubber weir 1 is upright, it is filled with air at a high water head pressure.
This is because it has the effect of pushing up the drain inside toward the drainage pump P side.

In the above configuration, when the rubber weir 1 is raised from a collapsed state, the valves 6 and 12 are closed.
Open valve 5 and operate blower 7. After the rubber dam 1 is completely erected, the valve 5 is closed.

Next, to discharge the drain accumulated at the bottom of the rubber weir 1, open the valve 12 and drain the drain pump P.
Priming water is injected into the drain discharge pipe 10 through the drain discharge pipe 10. This priming water is injected until the inside of the drain discharge pipe 10 from the check valve 11 to the drain pump P is completely filled. After the injection is completed, when the drain pump P is operated, the drain in the rubber weir 1 is completely discharged through the opening 10a and the check valve 11. Drain pump P
Normally, an axial flow pump with a head of about 7 m is used, but in the case of this embodiment, the air pressure inside the rubber weir 1 acts to discharge the drain, so the upper limit of the height difference H is 7 m. In practice, it is almost impossible to install the operation room O at a position lower than the top surface of the seawall B due to the positive weir high water head height. Therefore, the construction cost of drain discharge equipment is low.

In addition, in this embodiment, since the supply/exhaust system and the drain discharge system are separated, with the rubber weir 1 laid down, the drain is operated while supplying air into the rubber weir 1 with the blower 7. After that, water is supplied into the rubber weir 1 through a separately installed water supply pipe,
By repeating the operation of discharging the drain in the same manner as described above, the inside of the rubber weir 1 can be cleaned.

Note that the drainage pump used in this example can be installed on the seawall B, not in a deep trench.
Not only electric pumps but also engine pumps can be used.

As is clear from the above description of the embodiments, in the present invention, a check valve is attached to the drain discharge pipe of the flexible membrane weir, and the structure is such that the drain can be discharged using priming water. The device of the present invention has a simple structure, fewer failures, and low construction costs.

[Brief explanation of the drawing]

1 to 3 are sectional views showing a rubber weir equipped with a drain discharge device according to a known method, and FIG. 4 is a sectional view showing a rubber weir equipped with a drain discharge device according to an embodiment of the present invention. Cross-sectional view, FIG. 5 is a cross-sectional view of a river bed showing an example of installing a check valve. 1...Rubber weir, 2...River bed concrete, 2a...Top surface, 2b...Concave portion, 3...Slope surface, 4...Intake and exhaust pipe, 4
a...Opening, 5...Valve, 6...Exhaust valve, 7...
Blower, 10...Drain discharge pipe, 11...Check valve, 12...Valve, 13...Cover, B...Bank protection, O
...Operation room, P...Drain pump.

Claims (1)

[Scope of utility model registration request] In a flexible membrane weir that is laid watertight across the river bed and the slopes adjacent to both banks of the river, and that rises and falls depending on the supply and discharge of air, the river bed is separated from the openings of the supply and exhaust pipes. An opening for the accumulated water discharge pipe is provided in the face, and a drainage pump is connected to the tip of the accumulated water discharge pipe led out above the weir high water head level, and the level is equal to or lower than the opening of the accumulated water discharge pipe. in,
A flexible membrane weir, characterized in that a check valve is provided in the accumulated water discharge pipe.